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Doubled spreading efficiency for an ultra-wideband microwave covert communication system using dual optical frequency
Optics Express
|May 4, 2026
Summary
This study introduces an ultra-wideband microwave covert communication system using dual optical frequency combs (OFCs) to enhance spread spectrum technology. The novel system achieves doubled spreading efficiency and high-fidelity signal reception, advancing covert communication capabilities.
Area of Science:
- Optical Engineering
- Communications Engineering
- Signal Processing
Background:
- Spread spectrum technology is crucial for covert communications but limited by electronic hardware constraints.
- Existing systems face challenges with bandwidth and sampling rates, hindering performance.
Purpose of the Study:
- To propose an ultra-wideband microwave covert communication system utilizing dual optical frequency combs (OFCs).
- To enhance spread spectrum efficiency and overcome hardware limitations in electronic systems.
Main Methods:
- A joint optimization design combining electro-optic integrated spread spectrum processing and spectrum stitching technology.
- Implementation of a dual-OFCs architecture with 37 channels.
- A two-stage receiver architecture with optical pre-despreading and digital post-despreading.
Main Results:
- Doubled spectrum spreading efficiency achieved.
- Generated a signal with 11.68 GHz instantaneous bandwidth, 10 dB flatness, and a spreading factor of 1825.
- Tunable center frequency from 13.63 to 34.16 GHz.
- Achieved a processing gain of 29.5 dB, enabling reception at -21 dB SNR.
Conclusions:
- The proposed dual-OFCs system offers a simplified hardware architecture and enhanced flexibility for covert communications.
- Demonstrates high-fidelity and reliable signal reception under low SNR conditions.
- Presents a promising advancement for covert communication technologies.
